These are probably the most convincing Poser tears I have seen (and I certainly have no better ideas), but they do still look a bit subcutaneous;  i.e. they look as if they are below the skin, pushing it up, rather than rolling over the surface.   Perhaps, they are simply too transparent.   I realise that real tears are also transparent, but they also tend to be fast-moving, which causes them to catch the light in different ways as they fall.